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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fe50d46ac78e3c90495e4db48b947f96e2e9718667dfbed73e4b8516fe3604' 
  AND token = '4iVSwDMBzm1YyosMGF8lMNpluJkqzos97rxK8i8FmKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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