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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeadd3e58845054c5706802a82fe2cbb7a7165bec375e652b9b985f17ebc5d0' 
  AND token = 'VfC4ZgbxjJnqD+Tn0z2PtOtgirsmw4BNck0F9nJ7qW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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