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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5887b2a4857989340c5d9eb091a41235a7050986a6e5a17406ee1018308617' 
  AND token = 'I3EElMjk/sfwLVvVFiNI178t4BgrSal22VyRH/xs/KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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