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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c71ff17caadf962b3ffe60bc5b33d68589b3a1dd21b96ab4d714271807c1330' 
  AND token = '63xeq9415JLflaWXHKC8rd8BigOC37WLKNVROEW9YMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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