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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70f146844d4085e1e0faa062d60cd5dc86b42f1c4008cb80c20e713358b1c76' 
  AND token = 'm43n+rDddPs3ynwvAbtDookFSR8lvof1bh3gAjdltqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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