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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcc8a1df6bfb60768fbf1d8497452c6865223644ac4f7938b259841e8a98d57' 
  AND token = 'fVjYDX4JvMAp8wr82fv2s0lVpK0NiIoABEr7vW9HQjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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