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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bac538ce3a0c7fc1579b7ca8577b53efbce26efaa5ef4988451dfe9bb34ddb' 
  AND token = 'e+AYSDDEZkLeDavOCDUrQ6+reg+3Vv3tiaZ2FpAv3Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}