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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb42204d0b62b72fa1edb16182553af00b3e3a5767ecd5834fe14d5fe90c2e3c' 
  AND token = 'SVxoWUoFhcxKFxwFMk2C6t/SOGl3tlUXZGjwSz5wMCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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