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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8dc7806b1ffef9a5e529c5cbf30f5acd4a90400974044d1e49cf442d31681b' 
  AND token = 'nbos+kSojD4FY0VBCk3L/UMPZfwKrWev3IOfwZCtbIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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