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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c01bce1573d813914f93ab96d8a226de844aa5e634ade85810da21b980da75' 
  AND token = 'HtwMPypuFIkxSRSPLs66SCV32RyM2pagneSO2xuVSjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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