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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97283d74c43b54da0f2f96ee8d0fbdc103f24ba5689b82b93f26fa14af329e0' 
  AND token = '/7xChdZX87Qenjld4brWMNSBTi2bRh881P6HDH33Hdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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