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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1708a04062bf16a145fa74bc62c97b5da6baee86c9236449a476322679729b59' 
  AND token = '/yYLnMR3F2M21A1+CtK39rN2bTsp8ijGV7SPQb27iSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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