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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85be3bcfd5007b319880fdb458b04cfd3940177686504bbf41d77eb20abb979' 
  AND token = '0USs89uDO7Jraxq1IK10FmB9ekOwEKIRsI55bgIpj3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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