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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5e90e90963fe9a3b07f00f0906bb2c0b51f6256d4f90ffddee34a64d4fbd3f' 
  AND token = 'tOWFg6mmZFxdB0D/eAejHXYfttuwzJdUoup+OS/zXpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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