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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7cd621bd8ee1acb5ae0b4049ec207262d9ad5779fa1bf7a29ade932821bd5b' 
  AND token = 'nQkA30tnQC/FWS3e12ZvuQufJjWUKpGZBoueSi+ijZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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