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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c88e349aaac5b8d84bf31e331de147f2e7704edbaae01dba0e473a30364cbb' 
  AND token = 'oT+Nv+FLC2CRMx/cUF08Rsl9QeZ06757zUL1wau9FhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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