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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3190e02047b1ac8fc6042fa22fd2213e3fdd7f8f9661bf73646056599c50df' 
  AND token = '1n8l5UnrrpAcjm5qsUYkb5S7fq6ANVHa2CnrnaDhZM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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