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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1764a86dbaed5064d1b393f749fb4c85b43ce75df71ea66edf27ceda2f8e3e61' 
  AND token = 'Bddw/4oiuJDNcMrWySO3asrRtPTBEBwQiUu4qKA8hyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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