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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674a5db42d22a8a53d1ee5bff00c9c7dc765e9362abdf98452f54d352b463289' 
  AND token = 'Ye6Ll94Fp8J9Cg3jwBdB4B6gMchGQNMOiyFTOy5ymNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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