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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6935bed83a252fdee19f30387ac71aea42a74dd99a9696fe184081f2663c3c8' 
  AND token = '1Vd6RPmv/XmBYt4K2rH1Lg9azd+ytonARHcqo18NBCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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