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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a202fe93824e69353282fc5b0833190681376fb3f7d686696ddbc06684e776' 
  AND token = '10MCzJBeVlI9V0gvX0kX+2JWzEi+X7iabkANlxkYmXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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