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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08238329a6b685ed13e569c731511ffc995c3d376e307a5db872af2e4a1f5878' 
  AND token = '2WtdqGuAu5e+8+MJNH2BMAp47mNFIPHMxG2/ENpsbIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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