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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be8618938897561e5ccab500f40558bc2fd43bb85d3f69b5f7f5ac8c510cbaf' 
  AND token = 'lQ1xzUPcsp0+sGCoOBa+EOctdqFE7TCeyuxZSH4SvXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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