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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bbbbbc4f2fef3799bd9c0360e1cc2e23d2d19a544728a525eafc314ba387cd' 
  AND token = 'RyxtEetQF8pqYb4KsjzanOgpial3A8FmSZqGk912tcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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