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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96263c9633579a86cc8ca1502840c187dc2e60a2cc9ea390bba0ae19fe4bca4b' 
  AND token = 'VnyV+j7puB027lbF4JJuz3c5FaZYlvxRrqlu0PqlWI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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