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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34fe694746e8bee3d4f9e63f0d8de3083b07e3ee47adef10a0af98fb9bcd585' 
  AND token = 'wpa0j/Xbp1MTmFDdqLE/eNB9N9Lcywp53c4dypLHxZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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