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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d95cb672bfa5d8429c18773c325b7ae0f6c1dfb29af30721ab1fdd10b13a11' 
  AND token = 'QOI+FX7IrsQp+PwPhjFkutDW+iTBXIOfSPLtOl8CwjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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