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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43441fd86c23deefb0a710b555951af539976d0a9049f6eecaa060f119b3261' 
  AND token = 'la3pGse/xduP79n0/FDET9rx3mKmOCtHb64d+aDn3Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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