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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f716abce1475b8224951237a62dfeaa13d78a5d00e3d8f6c1e06dbe69731dbfe' 
  AND token = 'L6qub8v6fjHXK5f5aKvQxyWP+FLXk8S+qDXoe8RbszE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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