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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f57617f89b5e39bf05ef2d427529b9413f4716922f5a6a19fbe6bd7d7bee09e' 
  AND token = '2xUINrmRDHAXj33u/CrbnG6OfArXo8l5okq2hk9YN5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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