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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91abc0378c31feea36c4479254902c8178d1c67eddd58c5f715ab81d095316f3' 
  AND token = '6ydUI4+TZRbk/hP2i/c05hNGOjJX7yngI5DXkkzVhUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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