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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85f1cfdda8e78f36ccb5c7353ce2beebc346317bf55d9a0ca825920e0ea4c2c' 
  AND token = 'cM+yLIGz4CLPKHW/2rBx0cpexrPJeJZycfciRTSD+ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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