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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc3c88fc9e7527361c69c5f0ac9dd985e1e10722e2e0b453bb8e7631813f893' 
  AND token = 'pJlTFMIdUJ0zf7lguD0WiBVykxw5LqmMWjNbhVb+72w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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