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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c905f7fccb71b2303afe8dc2b72a0e3260cda54749aa006c0fef83234f749301' 
  AND token = '5bDDEqL4COOd2YZ0Noka8+I65ijlY6XKvLP1rH+Y/NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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