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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06927e9b5b8fa79a99ec179a49fa4053875f850aa686f790c2e612168ba8c1f9' 
  AND token = 'fmKEOM85uPJ43HfcCI7GzkwypasvvcqX5wlNjrgDNpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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