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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b8da65f64f8dc5fbb4fff406e8103f7bfa6fbe9e35df0b2d35888e20a983e1' 
  AND token = 'OT9QWYdzvoTLkw/1u7HiJoygkSJM8eWw2QHQzaieoKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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