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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4b22b27b3a818c4f45c74de3626e0d2978896e55de8634fffb3d2beb0d7bfe' 
  AND token = '6Epa4QyYwAW8H+qsyS1/r6mNYBMgLZU/CL6HI/oOeaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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