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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70726ae0d8469813beaa23792f6aba5e86a0d8880e0879fc270fcf393cb4d31d' 
  AND token = '1OieRudhqQ5IS4wjX+k+sEpYeNrrb02lgQFQRIScj6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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