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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12bd79c1678121153365248a1309816ac0e8258b6cceb208d3f93d3bcc25e58' 
  AND token = '7uD77/FL1P7CFnVHDis48Bw73x8R346Us0ZTTZ09FTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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