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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa86bd1009f07054a93e0c9a7ace77c9ca0f88abc338c8d7ea2d70bbaad2c44' 
  AND token = 'L1qosbw/NhDjOm4H2aEdc4Y56abscOuKKH7zzFW4kik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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