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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636cde5844c985f5aa5323bdd38605fbd5f735f09a03c6fa0f3fcfc2c23cece2' 
  AND token = 'UvLGSO6OcwijyUWrKdJY4Cmmb1TOEpFLDsDRg/8+wqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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