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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a511a34ec9c3630e2626e4e1f9338defe5ac35a093174291d9f340ccacc5e3e' 
  AND token = 'i4sEBhwctlXvWSeExOVZqj44L9uYHo84Xx8j2hJlpyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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