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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8812941484ac4db099528203dcee54f4ac24cafe667d2e23917e4ec25cfd36' 
  AND token = 'Cs+KV20eBidfuuo9goLNotYIRt5E4g6PL90T1tOwyt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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