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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb685636a19c3b1a1c59529e68daa22003c9d80f5c5fb4902ef5f5da13678bac' 
  AND token = 'p1iVzrnpAaQkyNYK33gSqkm2gEwTocZC67dPrtRSUC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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