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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062ab2c9aec49168290121ad5867d01d61061601d446360ca1d28eb9baad68d5' 
  AND token = 'TTl5N4fYm2V2HPmY1styAdPFOm+9532ua+Yc7LJfkVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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