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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2147ebc6e3a1d324a15d9f602a90f413b80a474d1fe625d10c4ebbaa4bee10' 
  AND token = 'VETKdBVeuPX+/SFYxds6IXWN1V0P8QijdiPlwwOBCz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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