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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edab37935f8a06d0c929433c673314e919cab4d3517876ae89b77e054ddc433d' 
  AND token = 'vDR2NbrB7hB158bmQkPZ7H8BPd8i+2KPuDt81mSG4eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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