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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ba04d62672e0db069ce888a8525e7c97599b08486b9d065a8a0a0461b7c667' 
  AND token = 'RJHinBtdNACbpk+UnvB7SQ6+K/Uk4LwUIBSY2nvN8Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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