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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c080062b6c2aa648893b972dce4f7cf03752f73383c2ed48a178643ae35a0e7a' 
  AND token = 'l/Ps8VW8l3/J1GRdYf5FQINP/fUo2OmFBJs06Lr9Fd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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