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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9799fbbf7960e0ffadb12a69ae8e0f578d1d3691b5bde373a8fc26c6febdb4cb' 
  AND token = '7+Xxjh8uJmEGsRZzvtr9HTXykV7AHHgMlSIwr9VQ2kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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