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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab885b6cf0f11277d7e23aa4d136fa430eea4cb715201b57c8fb0425496f024' 
  AND token = 'ETwAiuA78hWol2cP6l0k0xefnv6DZ7PSqfo85GKthWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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