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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0bb5c562e38c25b1989e0673c12426830b0730303949ae0b2da37803a9eb36' 
  AND token = 'SAF0QYi9THBOKvC2JJjAMCPOs8oSpXcARgZD1tapKF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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