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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7317077810b8e4daf409c88f53570985530bd17a0b5c33b383df5f2aac9c77cd' 
  AND token = 'F2gCJqevkDWBSGIVKkX7KasT3oy/UtOaYr6QdxQKc1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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