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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6079d6a3deabc9e05c1ab71f8531a9bc44c0b2955deb12f1af22fa4a87a5af' 
  AND token = 'C/OQkH/NqOez/ssrK6jf5iaSk93qJ9KjAD50S7rD2+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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