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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a053091ba387fc370cb2e911cdee98ab27383dd59db239aecbe11521a66018' 
  AND token = 'W5OGZNSfNpkv4gAmccntOucHsKHY3bfuXbzt8LUAiLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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