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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8e103305593d4f21082fc5a815dbce45e6ede919a1d4cac86b36136937b674' 
  AND token = '5iPq09gIPAfQ9YsXV2H9e7SpeTWVv2ZwpNzGn7QS1js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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