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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b919e3bb5b361e712ec85253ca1f33ea60cd46326d11422ce2d2d05db3a9d8e' 
  AND token = 'TSbJCQbyjZOMw7v9Ic9ZgWGE1r8Z0lbLOefnS2LzWKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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