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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c1c8d87a3f09fc62009a83f434cd93e180d557478bf55aeb16c914de6869b3' 
  AND token = '8qyH6zB3as8h/zatxLiX+i0e7D8OLrpIOZsTuBVAb3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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