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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3e1c0680e2ba509720014bb93d2a5028683e91a74f265eb8f7fd54803173c6' 
  AND token = 'c9euRtsjMHTEKdsGayChF/rKUCYqFdpDcAifwBN0M6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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