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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95086d22bbfdf774e6db28df43491b61a6b6eed7cb1879b4b9fb81c5d47a102a' 
  AND token = 'I5fveEgdXyWzcNgDqjGPbutckZ9JE9vpnGkngXL5dIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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