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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abbe1ba23fa363406d9c27525a1e44e9e71a7a468c01262e82c16edbe46e433' 
  AND token = 'h0FjgTz975f0kBxApbeNv+MDiv9Bo80dZqwL3/aMXy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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