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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4b13a89954c05a1cd28332ec3c1cac49ed104c13c191f7c8c1f76782ed8ede' 
  AND token = 's/egQ4oI2qebz1QQ5HhiHs+JRihRUagdRBKS9oHDbSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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